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sal•ta•tion

Pronunciation: (sal-tā'shun),[key]—n.1. a dancing, hopping, or leaping movement.
2. an abrupt movement or transition.
3. Geol.intermittent, leaping movement of particles of sand or gravel, as from the force of wind or running water.
4. Biol.a. a sudden discontinuity in a line of descent.
b. a mutation.